docs: def from_stub(cls, data, udas=None):
          """ Create a Task from an already deserialized dict. """
  
          udas = udas or {}
          fields = cls.FIELDS.copy()
          fields.update(udas)
  
          processed = {}
          for k, v in six.iteritems(data):
              processed[k] = cls._serialize(k, v, fields)
  
          return cls(processed, udas)